Steel 45L

Designation

Name

The value

Designation GOST Cyrillic

45Л

Designation GOST Latin

45L

Transliteration

45L

By chemical elements

45

Description

45L steel is used: for the manufacture of castings working parts for wear; machine beds, gears and gear rings, brake discs, clutches, casings, rollers, sprockets and other parts, which are requirements of high strength and high wear resistance under static and dynamic loads; casting parts mining and metallurgical machinery; casting investment casting for aircraft industry group I — loaded items with the specific requirements for density and mechanical properties: high load brackets, sealed the housing, the frames of gyroscopes, stabilizers, etc. and group II — non-loaded and lightly loaded parts, rings, flanges, fittings, leaking instrument cabinets, etc.

Chemical composition

Standard

C

S

P

Mn

Si

Fe

KSt 81-033:2009

0.42-0.5

≤0.04

≤0.04

0.45-0.9

0.2-0.52

Rest

Fe is the basis. The mass fraction of S and P content is indicated for 1 group of castings from the base steel. The content of sulfur and phosphorus in the castings of groups 2 and 3, in sour and basic open-hearth steel - see Table 4a in GOST 977-88.

Welding defects of castings after cutting is carried out with preliminary and attendant heating to 150-200 °C. for semi-automatic welding in carbon dioxide environment used welding wire SV-08G2S diameter of 2 mm at a current of 380-420 A. Welding defects by manual welding is done with electrodes Э50А type (GOST 9467) brand SSSI-13/55. Before mechanized welding of large defects of the edge samples, it is recommended to coat the electrodes of these brands. The thickness of the facing layer of 8-10 mm. After welding should slow cooling with rate 50 °C/h.